05-12-2008
Is there some sort of pattern to "certain addresses"? That would indicate a routing problem, perhaps external to the machine itself. Do other things besides telnet work? What about ping, traceroute, ssh?
Are you using DHCP? Did the machine's IP address change, like, for instance, not so coincidentally around the time the problems started?
Do you have working reverse DNS, and do the other machines possibly care whether or not you do? Is there anything else on their end which might be preventing the connections?
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LEARN ABOUT DEBIAN
fence_rsa
FENCE_AGENT(8) System Manager's Manual FENCE_AGENT(8)
NAME
fence_rsa - Fence agent for IBM RSA
DESCRIPTION
fence_rsa is an I/O Fencing agent which can be used with the IBM RSA II management interface. It logs into an RSA II device via telnet and
reboots the associated machine. Lengthy telnet connections to the RSA II device should be avoided while a GFS cluster is running because
the connection will block any necessary fencing actions.
fence_rsa accepts options on the command line as well as from stdin. Fenced sends parameters through stdin when it execs the agent.
fence_rsa can be run by itself with command line options. This is useful for testing and for turning outlets on or off from scripts.
Vendor URL: http://www.ibm.com
PARAMETERS
-o, --action=<action>
Fencing Action (Default Value: reboot)
-a, --ip=<ip>
IP Address or Hostname This parameter is always required.
-l, --username=<name>
Login Name This parameter is always required.
-p, --password=<password>
Login password or passphrase
-S, --password-script=<script>
Script to retrieve password
-c, --command-prompt=<prompt>
Force command prompt (Default Value: >)
-x, --ssh
SSH connection
-k, --identity-file=<filename>
Identity file for ssh
-u, --ipport=<port>
TCP port to use for connection with device
-v, --verbose
Verbose mode
-D, --debug-file=<debugfile>
Write debug information to given file
-V, --version
Display version information and exit
-h, --help
Display help and exit
--power-timeout
Test X seconds for status change after ON/OFF (Default Value: 20)
--shell-timeout
Wait X seconds for cmd prompt after issuing command (Default Value: 3)
--login-timeout
Wait X seconds for cmd prompt after login (Default Value: 10)
--power-wait
Wait X seconds after issuing ON/OFF (Default Value: 0)
--delay
Wait X seconds before fencing is started (Default Value: 0)
--retry-on
Count of attempts to retry power on (Default Value: 1)
ACTIONS
on Power on machine.
off Power off machine.
reboot Reboot machine.
status This returns the status of the plug/virtual machine.
list List available plugs with aliases/virtual machines if there is support for more then one device. Returns N/A otherwise.
monitor
Check if fencing device is running. List available plugs/virtual machines or get status of machine (if it does not support more).
metadata
The operational behavior of this is not known.
STDIN PARAMETERS
action Fencing Action (Default Value: reboot)
ipaddr IP Address or Hostname This parameter is always required.
login Login Name This parameter is always required.
passwd Login password or passphrase
passwd_script
Script to retrieve password
cmd_prompt
Force command prompt (Default Value: >)
secure SSH connection
identity_file
Identity file for ssh
ipport TCP port to use for connection with device
verbose
Verbose mode
debug Write debug information to given file
version
Display version information and exit
help Display help and exit
power_timeout
Test X seconds for status change after ON/OFF (Default Value: 20)
shell_timeout
Wait X seconds for cmd prompt after issuing command (Default Value: 3)
login_timeout
Wait X seconds for cmd prompt after login (Default Value: 10)
power_wait
Wait X seconds after issuing ON/OFF (Default Value: 0)
delay Wait X seconds before fencing is started (Default Value: 0)
retry_on
Count of attempts to retry power on (Default Value: 1)
fence_rsa (Fence Agent) 2009-10-20 FENCE_AGENT(8)